8138021902 has 16 divisors (see below), whose sum is σ = 12239175312. Its totient is φ = 4058311680.

The previous prime is 8138021893. The next prime is 8138021911. The reversal of 8138021902 is 2091208318.

It is an interprime number because it is at equal distance from previous prime (8138021893) and next prime (8138021911).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1429153 + ... + 1434835.

It is an arithmetic number, because the mean of its divisors is an integer number (764948457).

Almost surely, 2^8138021902 is an apocalyptic number.

8138021902 is a deficient number, since it is larger than the sum of its proper divisors (4101153410).

8138021902 is a wasteful number, since it uses less digits than its factorization.

8138021902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7443.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 8138021902 is about 90210.9854840307. The cubic root of 8138021902 is about 2011.4363059742.

The spelling of 8138021902 in words is "eight billion, one hundred thirty-eight million, twenty-one thousand, nine hundred two".